To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Recent changes to sysctl.h breaks glibc
Date: 20 May 2003 15:10:08 -0700
Organization: Transmeta Corporation, Santa Clara CA
Message-ID: <bae940$2m5$1@cesium.transmeta.com>
References: <20030519165623.GA983@mars.ravnborg.org> <200305200024.h4K0OnPc025466@turing-police.cc.vt.edu> <m1y9121mdp.fsf@frodo.biederman.org> <200305200111.h4K1BJPc026622@turing-police.cc.vt.edu>
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Followup to:  <200305200111.h4K1BJPc026622@turing-police.cc.vt.edu>
By author:    Valdis.Kletnieks@vt.edu
In newsgroup: linux.dev.kernel
> 
> > For a lot of system calls it is actively dangerous to assume dev_t ==
> > __kernel_dev_t.  As glibc does some cute things in there.
> 
> I thought that sort of fun and games was *WHY* userspace can't use the
> kernel headers in the first place?
> 

Indeed.  Because they try to export dev_t, not __kernel_dev_t (unless
you know exactly what you're doing, which most people don't.)

dev_t should be defined by the library ABI, not by the kernel ABI.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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